Table 1.

Patient characteristics.

Case	Age (years)	Sex	Histology	Biopsy method	Tumor size (cm)	Pathologic fracture	Approach	Knee joint	Bone resection length (cm), percentage of total femoral length	Resected muscle	Defect size (cm)	Implant coverage percentage
1	15	Female	Conventional osteosarcoma	Open	7×6×10	No	Lateral	Extra-articular resection	15, 38%	Vastus medialis, lateralis, intermedius	14×6	100%
2	74	Male	Atypical cartilaginous tumor → Dedifferentiated chondrosarcoma	Unplanned surgery (curettage and plate fixation)	4×3×11	Yes	Lateral	Extra-articular resection	29, 63%	Vastus medialis, lateralis, intermedius, iliotibial tract	14×6	80%
3	58	Female	Local recurrence of conventional osteosarcoma in the vastus lateralis	Needle	4×4.5×8.5	No	Lateral	Extra-articular resection (initial surgery)	14, 35% (initial surgery)	Vastus lateralis, iliotibial tract	11×6	100%